Source of uncertainty	Level of uncertainty
Hazard characterisation (TDI)	‘Low to medium’ to ‘Medium to high’
Concentration of melamine in milk powder	‘Medium to high’
Consumption of Chinese chocolate	‘Medium to high’ to ‘High’
Impact on risk assessment of these three sources of uncertainty combined	‘Medium to high’a

^aThe category ‘Medium to high’ uncertainty was defined as follows: ‘Some or only incomplete data available; evidence provided in small number of references; authors’ or experts’ conclusions vary, or limited evidence from field observations, or moderate data available from other species which can be extrapolated to the species being considered’.